Realization of large-scale plastic extrusion machines can reduce production costs, which in a large twin screw plastic granulating machine, film blowing machine, pipe extruder of advantage is more obvious. Equipment required for key national construction services, a large ethylene project of three large extruding and pelletizing unit, one of the most important facilities rely on imports for a long time, it is necessary to speed up the localization process and meet the needs of petrochemical industry.